Superparamagnetic Nanoparticle-Supported (S)-Diphenyl- prolinol Trimethylsilyl Ether as a Recyclable Catalyst for Asymmetric Michael Addition in Water
作者:Bang Gen Wang、Bao Chun Ma、Qiong Wang、Wei Wang
DOI:10.1002/adsc.201000508
日期:2010.11.22
A new superparamagneticnanoparticle-supported (S)-diphenylprolinol trimethylsilylether (Jørgensen–Hayashi catalyst) was synthesized and applied for the asymmetricMichaeladdition of aldehydes to nitroalkenes in water, which gives products in moderate to good yields (up to 96%), good enantioselectivity (up to 90% ee) and diastereoselectivities (up to 99:1). The immobilized catalyst could be easily
“Bottom-Up” Embedding of the Jørgensen-Hayashi Catalyst into a Chiral Porous Polymer for Highly Efficient Heterogeneous Asymmetric Organocatalysis
作者:Chang An Wang、Zhi Kun Zhang、Tao Yue、Ya Lei Sun、Lei Wang、Wei David Wang、Yuan Zhang、Chong Liu、Wei Wang
DOI:10.1002/chem.201200753
日期:2012.5.29
construction of a robust chiralporouspolymer (JH‐CPP) embedded with the Jørgensen–Hayashicatalyst (JH) has been successfully achieved for highlyefficientheterogeneousorganocatalysis. The high BET surface area, wide openings and interconnected nanopores of JH‐CPP increase the accessibility of catalytic sites and as such the catalyst shows excellent activity in catalyzing the asymmetric Michael addition
Michael addition of carbonyl compounds to nitroolefins under the catalysis of new pyrrolidine-based bifunctional organocatalysts
作者:A. Castán、R. Badorrey、J. A. Gálvez、P. López-Ram-de-Víu、M. D. Díaz-de-Villegas
DOI:10.1039/c7ob02798b
日期:——
the asymmetric Michael addition of carbonyl compounds to nitroolefins have been synthesised from homoallylamines, which are easily obtained from (R)-glyceraldehyde as a chiral precursor. Under optimal reaction conditions, these bifunctional organocatalysts showed a high catalytic efficiency (almost quantitative yield in most cases) and stereoselectivity in the Michael addition reactions of a variety
Synthesis of new pyrrolidine-based organocatalysts and study of their use in the asymmetric Michael addition of aldehydes to nitroolefins
作者:Alejandro Castán、Ramón Badorrey、José A Gálvez、María D Díaz-de-Villegas
DOI:10.3762/bjoc.13.59
日期:——
pyrrolidine-based organocatalysts with a bulky substituent at C2 were synthesized from chiral imines derivedfrom (R)-glyceraldehyde acetonide by diastereoselective allylation followed by a sequential hydrozirconation/iodination reaction. The new compounds were found to be effective organocatalysts for the Michael addition of aldehydes to nitroolefins and enantioselectivities up to 85% ee were achieved
Peptide and Enzyme Catalysts Work in Concert in Stereoselective Cascade Reactions—Oxidation followed by Conjugate Addition
作者:Jasper S. Möhler、Mathias Pickl、Tamara Reiter、Stefan Simić、Jonas W. Rackl、Wolfgang Kroutil、Helma Wennemers
DOI:10.1002/anie.202319457
日期:2024.3.18
An enzyme and a peptide catalyze—in an aqueous buffer—a two-step cascade reaction with high chemo- and stereoselectivity in one pot. The optimization of the modular peptide catalyst and the identification of common reaction conditions were key for bringing the two worlds of enzyme and peptide catalysis together.